Redirect with PHP instead of .htaccess

common.php

@@ -0,0 +1,18 @@
+<?php
+/**
+ * PHP web interface for youtube-dl (http://rg3.github.com/youtube-dl/)
+ * PHP file included on all pages
+ *
+ * PHP Version 5.3.10
+ *
+ * @category Youtube-dl
+ * @package  Youtubedl
+ * @author   Pierre Rudloff <rudloff@strasweb.fr>
+ * @author   Olivier Haquette <contact@olivierhaquette.fr>
+ * @license  GNU General Public License http://www.gnu.org/licenses/gpl.html
+ * @link     http://rudloff.pro
+ * */
+if (MAINTENANCE) {
+    header('Location: maintenance.php'); exit;
+}
+?>